Transportation source distribution is a key object and factor of urban transportation management and plan.

交通源分布是城市交通管理和规划的重点对象和考虑因素。

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Analysts predict the operation costs for delivery companies in the city will increase sharply as electric bicycles are a major transportation source at the terminal of delivery.

有分析认为，由于电动自行车是目前快递公司在终端配送中使用的主要交通工具，限制电动车行驶将大幅提高深圳快递企业运营成本。

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Moreover, because gas is frequently encountered in association with oil, the production, refinement, transportation, and storage of crude oil is also a source of methane emissions.

此外，由于天然气常与石油混在一起，原油生产、提炼、运输和储存也是一个甲烷排放来源。

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(Speaking) Institute director Eric Leonhardt says he's had his eye on the dairy herd as a source of transportation fuel for a long time.

VOA: standard.2010.02.23

"Our vision is that one of these plants would be the core element of a community energy center" that could provide a local, sustainable source of both transportation and heating fuel.

FORBES: Ethanol

The car was built by the SUNY New Paltz Solarcar Racing Team in partnership with The Solar Energy Consortium as a way to promote environmentally conscious design and solar power as a viable energy source for personal transportation.

FORBES: In Which I Lose the Wheel of a $250,000 Solar Car

Their streets and subway cars are aging, and the obvious source of funding for transportation repairs, the gas tax, is drying up as drivers switch to hybrids and high-mileage cars.

FORBES: Drive-By Pricing